Add a flag to enable Translate Compact Infobar on Android.

components/translate/core/browser/translate_infobar_delegate.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_INFOBAR_DELEGATE_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_INFOBAR_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 11 matching lines @@
 #include "components/translate/core/browser/translate_ui_delegate.h"
 #include "components/translate/core/common/translate_constants.h"
 #include "components/translate/core/common/translate_errors.h"
 
 namespace infobars {
 class InfoBarManager;
 }
 
 namespace translate {
 
+// Feature flag for "Translate Compact Infobar UI" project.
+extern const base::Feature kTranslateCompactUI;
+
 class TranslateDriver;
 class TranslateManager;
 
 class TranslateInfoBarDelegate : public infobars::InfoBarDelegate {
  public:
   // The types of background color animations.
   enum BackgroundAnimationType {
     NONE,
     NORMAL_TO_ERROR,
     ERROR_TO_NORMAL
@@ skipping 187 matching lines @@
 
   // Whether the translation was triggered via a menu click vs automatically
   // (due to language detection, preferences...)
   bool triggered_from_menu_;
   DISALLOW_COPY_AND_ASSIGN(TranslateInfoBarDelegate);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_INFOBAR_DELEGATE_H_